Here is the analysis of the times displayed on the clocks and their corresponding sentences:
1. The first clock shows 7:00. The matching sentence is 'It's seven o'clock.'
2. The second clock shows 10:10. The matching sentence is 'It's ten past ten.'
3. The third clock shows 8:45. The matching sentence is 'It's quarter to nine.'
4. The fourth clock shows 7:30. The matching sentence is 'It's half past seven.'
5. The fifth clock shows 2:55. The matching sentence is 'It's five to three.'
6. The sixth clock shows 9:33. The matching sentence is 'It's twenty-seven to ten.'